问题 单项选择题

大开颌运动为()。

A.发生在颞下颌关节上腔的滑动

B.发生在颞下颌关节上腔的转动

C.发生在颞下颌关节下腔的滑动

D.发生在颞下颌关节下腔的转动

E.下腔的转动与上腔的滑动相结合的混合运动

答案

参考答案:E

解析:大开颌运动:指非用力的自然大张口运动,上下切缘之间为37~45mm开口度。开口超过一定限度时,髁突带动关节盘沿关节结节的后斜面向前下方滑动。在盘突复合体滑行过程中,髁突继续向前方旋转,关节盘则稍向后方旋转。因此大张口运动是同时发生在关节上下腔,同时有旋转和平移相结合的复杂运动。

单项选择题
阅读理解

阅读理解

     You may know your mother, but how well do you really know Mother's Day? Cards, flowers, sales,

TV specials, and a day off for someone who really deserves it ---- those are what probably come to

mind for many people when they think of Mother's Day. But there's more to the story.

     The earliest Mother's Day celebrations were held during spring in ancient Greece. The celebrations

honored Rhea, the Mother of the gods. During the 1600's, England celebrated a day called Mothering

Sunday. On this day even servants were given the day off to spend with their families. A mothering cake

was even served with the family meal.

      In the US, Mother's Day began in 1872 when Julia Ward Howe, who wrote the words to the famous

song The Battle Hymn of the Republic, suggested it as a day devoted to peace. But it didn't really become popular until 1907 when Anna Jarvis stared a campaign to honor mothers. She believed that mothers

could help people get over the pain they experienced during the Civil

     War. The US isn't alone in devoting a day to mothers. Many other countries including Denmark,

Finland, Italy, Turkey, Australia, Japan, and Belgium also honor their mothers in May. Other countries

honor their mothers at different times of the year.

     Learning more about Mother's Day and celebrating Mother's Day are important, but probably not as

important as understanding what your own mother, or grandmother, or aunt has really done for you.

And that will certainly be appreciated more than one day in a year.

1. What is the passage mainly about?

A. The reason why people celebrate Mother's Day.

B. The ways people honor mothers.

C. The history of Mother's Day.    

D. The great contribution of mothers.

2. Where was the earliest Mother's Day celebrated?

A. In ancient Greece.

B. In the US.

C. In England.

D. In Italy.

3. We can learn from the passage that _____.

A. Rhea is the mother of a king in ancient Greece

B. not all the countries celebrate Mother's Day in May

C. only mothers were given a day off on Mothering Sunday

D. it was in 1872 that Mother's Day really came into being

4. The last paragraph tells us that _____.

A. all the people should celebrate Mother's Day

B. only mothers are honored on Mother's Day

C. understanding mothers' work is more important than just celebrating Mother's Day

D. people should celebrate Mother's Day every day